Slide fastener



J. FOLK SLIDE FASTENER Jan. 8, 1946.-

2 Sheets-Sheet 1 Filed Dec. l5, 1943 .7.; INVENTOR.

ATTOQ/VEY J. PQLK SLIDE FAS TENER Jan. 8, 1946.

Filed Dec. l5, 1943 2 Sheets-Sheet 2 ATTORNEY Patented Jan. 8, 1946 UNITED STATES PATENT OFFICE suma FAsrnNnn Joseph Polk, New York, N. Y.

Application December 15, 1943, Serial No. 514,318 1 citan.. (c1. 24-2o5) This invention relates to new and usefull improvements in a plastic or die cast fastener element for a slide fastener.

More specifically, the invention proposes the construction of a plastic or die cast fastener element for a slide fastener which is adapted to be cast of plastic material and which has no surfaces extended into any of its faces forming recesses permitting the fastener element to be cast in a mold without the use of cores.

Still further it is proposed to characterize the fastener element by a member formed with a passage extended inwards from one end thereof in a manner to receive the edge portion of a conventionally constructed piece of tape of the type generally used for supporting fastener elements of a slide fastener stringer.

A further object of the invention proposes forming the other end of the member with staggered projections arranged in a manner to be engaged with corresponding projections of an adjacent slide fastener element by means of a conventionally constructed pull tab slide for engaging the slide fastener of adjacent rows to close an opening formed in an article to which the slide fastener is attached.

Still another object of the invention proposes forming the projections upon the fastener elements in such a manner that when they are engaged with each other by means of the pull tab slide they will be inter-engaged so as to retain the elements against relative movement in all directions.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended' claim in which the various novel features of the invention are more particularly set forth. l

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a plan view of adjacent slide fastener stringers provided with plastic or die cast elements constructed in accordance with this in-v vention.

Fig. 2 is a View similar to a portion of Fig. 1.

Fig. 3 is a view looking in the direction of the line 3 3 of Fig. 2.

Fig. 4 is a view looking in the direction of th'e line 4 4 of Fig. 2.

Fig. 5 is a perspective view of one of the fastener elements, per se.

Fig, 5A is a vertical sectional view on the line 5A-5A of Fig. 1.

Fig. 6 is a view similar to Fig. 1 but illustrating a modification of the invention.

Fig. 7 is a perspective view of one of the fastener elements used in the form of the invention shown in Fig. 6.

The plastic or die cast fastener element for slide fasteners, according to this invention, includes a member I0 having a passage I I extended inwards from one end thereof. The passage II is provided for the purpose of receiving the edge portion I2 of a piece of tape I3 for supporting the fastener elements of a, slide fastener Stringer. The tape I3 is of conventional construction and has its edge portion I2 bulged so as to be engageable within the passage II. The material of the member I0 surrounds the passage II forming arms I4 and Il which are clamped about the bulged edge portion I2 preventing the fastener from being pulled off the tape I3.

The other end of the member I0 is formed with a pair of projections I5 and I5X on its sides and adjacently staggered in relation to each other. These projections I5 and I5X are located upon the half side I0 of the member I0 located on one side the passage I l.

The member I0 is also provided with a second pair of projections I6, I6X which are adjacently staggered in relation to each other. These latter projections I6 are formed on the half side II)h of the member I0 located on the other side the passage Il. In this ilrst form of the invention the projections I5, I5X and I5, ISX have rounded extended surfaces of substantially semi-ellipsoidal configuration and the first pair of projections I5 and I5X are arranged in a staggered relation upon their respective sides with relation to the second pair of projections I6, IGX.

The members I0 are adapted to be engaged in a staggered relation upon the adjacent edges of an adjacent pair of tabs I3 so that when the fasteners are engaged with each other by a conventional pull tab slide (not shown on the drawings) the projections I5, I5X and I6, IEX will be inter-engaged between the adjacent sides of the members I0. The staggered relationship of the projections I5, I5X and I6, I5X when in their engaged position, as shown in Fig. 1, will cause the projections to strike each other on two adjacent sides to prevent relative movement between the members I0 in all directions, maintaining them in their inter-engaged position until such time as the pull tab slide is moved in a proper direction to separate them.

In the modification of the invention shown in Figs. 6 and 7 the construction of the members I0' is similar to that previously described except for the conilguration of the projections I5', l5" and li', I6". 'I'he projections I5', I5 and I6', I6" are formed with straight sides and ends giving them a trapezoidal-like shape.

In other respects this form of the invention is similar to that previously shown and like reference numerals identify like parts in each of the several views.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claim.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

A plastic or die cast fastener element for a 2 slide fastener, comprising a member having a passage extending inwards from one end for receiving the edge portion o1' a piece of tape used for supporting the fastener elements of a slide fastener Stringer, the'material of said member adjacent said passage forming arms by which said member may be clamped upon said piece of tape, the other end of said member having a pair of projections on its sides and adjacently staggered in relation to each other and located beyond one end of 4said passage and said other end also having a second pair of projections on its sides and adjacently staggered in relation to each other and located beyond the other end of said passage, said second pair of projections being staggered in relation to said iirst named pair of projections. said projections being formed with rounded ends of j lsemielli; isoidal conguration.

JOSEPH POLK. 

